The Planetary Accounting Framework: a novel, quota-based approach to understanding the impacts of any scale of human activity in the context of the Planetary Boundaries

Table 3 The Planetary Quotas

Planetary Quota	Control Variable and Global Limit	Description of Control Variable
Carbon dioxide	Net CO₂ emissions ≤ −7.3 GtCO₂/yr	Net CO₂ emissions including land use and land-use change emissions.
Me-NO	Me-NO emissions ≤5.4GtCO₂e/yr	Total warming potential of methane and nitrous oxide emissions expressed in terms of equivalent CO₂ emissions (CO₂e).
Forestland	Deforestation ≤ -11Mha/yr	Net deforested land area.
Aerosols	0.04 ≤ AODe^a ≤ 0.1	Emissions of aerosols and precursor gases expressed in terms of equivalent aerosol optical depth (AODe)
Ozone	Montreal gas emissions ≈ ≤0 ODPkgs^b/yr	Emission of gases controlled or due to be controlled under the Montreal Protocol in terms of ozone depleting potential weighted kilograms (ODPkg)
Nitrogen	Net nitrogen released to the environment ≤62Tg/yr	Net reactive nitrogen released to the environment.
Phosphorous	Net phosphorus released to the environment ≤11Tg/yr	Net phosphorus released to the environment.
Water	Net water consumption ≤8500km³/yr	Net green, blue and grey water consumption
Biodiversity	Percentage disappearing fraction of species ≤1E-4/yr	Net percentage disappearing fraction of species due to land occupation and transformation
Novel entities	Net imperishable waste ≤0 kg	Imperishable waste released to the environment less imperishable waste removed from the environment.

^aAODe: Aerosol Optical Depth equivalent (see Section “A Quota for Aerosols”)
^bODPkg: Ozone Depleting Potential kilograms (see Section “A Quota for Ozone Depleting Substances”)

ISSN: 2520-8748